Hamlet rushed to Ophelia's room because he had a nightmare about her.

And lose the name of action. When he asked what should such fellows as he do crawling between earth and heaven: Hamlet to Ophelia ("Get thee to a nunnery!") in (III.i.123-132) --

Hamlet to Ophelia | Words, Words, Words | Pinterest

Hamlet to Ophelia: “Why wouldst thou be a breeder of sinners? Get thee to a nunnery.”

“Hamlet to Ophelia.” College English April 1955: 403-415

Polonius acquires a love letter from Hamlet to Ophelia. He then reads it aloud to the court. How humiliating for them both. Timeless audiences of young people have cringed to imagine a parent coming across their love notes and making them public.

Polonius acquires a love letter from Hamlet to Ophelia

No, not I, I never gave you aught” – Hamlet to Ophelia as she attempts to return gifts that he gave her in the past. His response may suggest that he views this ‘new’ Ophelia as a stranger. His view of women has certainly suffered.

Said Hamlet to Ophelia,I'll draw a sketch of thee,What kind of pencil shall I use? 2B or not 2B?
The mind of Hamlet after the silent struggle with Ophelia, when he in a state of somnambulism entered her apartment unannounced, cannot better be described than he does in his famous soliloquy. The King who fears his "turbulent and dangerous lunacy," consents to the plan of Polonius, whereby Hamlet is to meet Ophelia in order that the King and Polonius "may of their encounter frankly judge, and gather by him as he is behaved, if 't be the afflictions of his love or no that thus he suffers." Ophelia, at the suggestion of her father, pretends to be reading a book, while the King and Polonius are hid from view, but in hearing. Hamlet, oblivious of the presence of any one, soliloquizes:Extremely pleased, Claudius says he will answer the petition later, for he is at the end of his patience in waiting to hear Polonius' report on Hamlet. Polonius is tickled to be center stage and promises to be brief in his account - "since brevity is the soul of wit" - but he just isn't quite the master rhetorician that he fancies himself. He babbles at length, even after Gertrude interrupts him with an impatient "More matter with less art" (i.e. "Give me substance, not flowery phrases!"). Quoting a letter from Hamlet to Ophelia, Polonius declares that Hamlet's affectionate words to his daughter betray an obsessive and unrequited love. The words he reads aloud seem quite natural to a young lover, so Polonius finds it necessary to explain further: Ophelia, having followed her father's commands, has exasperated Hamlet by ignoring his advances, to the point where the love-sick Hamlet has now lost his mind. The King and Queen are neither convinced nor unconvinced by Polonius' diagnosis. They therefore agree to observe in secret an interaction between Hamlet and Ophelia.
89. "O dear Ophelia, I am ill at these numbers." Hamlet to Ophelia "live" in flashback. Perfect.

"We are arrant knaves all," said Hamlet to Ophelia

Claudius and Gertrude, the king and queen, have commissioned courtiers Rosencrantz and Guildenstern, Hamlet’s childhood acquaintances, to keep Hamlet company. Anon, Polonius, the Lord Chamberlain, enters the scene and informs the king and queen that he has found out the cause of Prince Hamlet’s distemper and proposes to give proof, but not before the king and queen give audience to Cornelius and Voltemand who have returned from Norway with good news. The news is good indeed: Fortinbras has turned his aggression against Poland and he only requires that Denmark permit his troops to march through her en route to Poland. Pleased with the news, Claudius dismisses the ambassadors from Norway and turns to the business of his disgruntled nephew. After much beating about the bush, Polonius produces a document. It is a love letter from Hamlet to Ophelia. Polonius avers that the cause of Hamlet’s distemper can be no other than his injunction forbidding Ophelia to reciprocate Hamlet’s affections. To prove it, Polonius proposes to engage the prince directly while the king and queen hide and observe. The scheme is agreed to and is carried out by and by. The desired proof is scarcely produced but there’s no persuading Polonius who will test his theory again, later.

Hamlet rushed to Ophelia's closet because he had a nightmare about her. That's one reason why he later mentions

Hamlet: Ophelia | Character Analysis | CliffsNotes

Polonius then advances his story about Hamlet. He reads a love letter from Hamlet to Ophelia. He tells Claudius and Gertrude of his advice to Ophelia, and of her actions, and finally of Hamlet's response. Claudius and Gertrude agree that love could be the cause of Hamlet's madness.

another polonius, also a letter from hamlet to ophelia that reads like it was copied almost directly from sparknotes

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But, in this scene, Hamlet was mute. Unlike his father,Hamlet refused to pass on the madness. He was , but he would not speak them to Ophelia.

As Hamletlater said, "," but with his silence Hamlettried to protect Ophelia from that breath of contagion.